300.000$/Bitcoin is really too much. Hope naturally that this price will be reached within that year, but I don't think so, because market cap required is too huge. If this will happen, we will be able to consider the bitcoin as new gold, a digital gold

Its perfectly possible. If you consider that Bitcoin can potentially reach trillions of dollars for a marketcap, you can predict that the price can reach 3 figures in a decade.
Was just going to say, market cap isn't that huge if you compare it to the world's population, not even if you just take the part of the population which has access to the internet.
It will be a glorious moment when it goes over $1000 again, and after that happens it will get some mainstream attention again and people will start to use it as a way to keep their money safe, just like gold/silver.